JPH05504395A - Brake shoes with chamfer lining - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Brake shoe with chamfer lining [Background technology] For spot-type disc brakes, especially the new lining During key operation (running-in), large amounts of wear occur in the radial direction. In many cases, this This is an undesirable installation error, or the purchased lining is not compatible with the brake used. This is due to non-compatibility. The radial and tangential friction forces of the lining are different. Ru. As a result, the surface of the lining presses against the brake disc in an uneven manner This has a significant impact on lining wear. This allows the lining to Not only will it wear to the top, but it will also cause force to be applied to the brake housing through the lining. affect and, in extreme cases, a twist (tiit) or above It is raised to the contour of the wheel dish.

Unevenness in the entry and exit areas of the lining promotes wear of the lining. especially , even more so when the lining extends significantly from the sector corner of the brake disc. It is.

The problem is discussed in detail in the unexamined German publication Nα2.517.109. There is. As a countermeasure against this, chamfers are added to the surface layer of the lining in the radial direction along the lateral edges. It is known to provide -. German unexamined publication No. 022.314 ．． 135, this type of chamfer is used to reduce the inclination of the lining to the brake disc It is disclosed to act on the oblique portion.

In addition, the unexamined French publication NQ, 2.312.690 describes measures to reduce noise. A chamfer is shown on the tangentially extending lower edge.

In principle, a relatively small part of the lining wears out during operation and is removed as quickly as possible. It is important that the lining contacts the brake disc evenly and at the correct angle to ensure longevity. Preferable to lengthen.

[Disclosure of invention] The present invention relates to a brake shoe as stated in the preamble of the main claim. Ru. The purpose of the invention is to extend the life of brake linings and to The goal is to shorten the period as much as possible.

The object of the invention is achieved by the features of the main claim. That is, books In the invention, the shape of the chamfer has an extremely small amount of wear on the chamfer lining. This is something that is becoming more and more common. In principle, light can be reduced with less braking action. A uniform surface of the chamfer lining is obtained, so that subsequent parts of the chamfer lining Extends the life of the lining by rapidly increasing its surface area.

Claim 2 describes a suitable chamfer shape that can be easily manufactured mechanically. It is.

Claim 3 accurately describes the shape. Claim 4 includes a preferred shape. is listed. In this case, the chamfer may be incorrect, or the brake shoes may be defective. Eliminate disadvantages due to uniform loading (e.g. inclined mounting of brake shoes) It is used for removing at the same time. The above-mentioned chamfer is applicable to claims 5 and 6. tangentially to the upper edge and/or to the two lateral edges, or a combination thereof It will be established.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

[Brief explanation of the drawing] Figure 1 shows a brake engine with a lining that is chamfered in three areas. Show knee.

Figure 2 is a cross-sectional view of the brake shoe taken along the dashed line B-B in Figure 1. The hatched portion showing the surface excludes the lining for ease of understanding.

3 is a cross-sectional view of FIG. 2 taken along line A--A of FIG. 1;

[Example code] FIG. 1 shows a brake shoe 1 having a lining 2 on a back plate 9, The lining is chamfered circumferentially in the lateral edge area 4.5 of 2 and in the upper edge area 3. It is.

A chamfer contour 6 of the lateral area 4.5 is shown in FIG. 2, which contour 6 has a hyperbolic shape. It has become. FIG. 2 also shows the wear height Δh. This is a one-time shake. The amount of wear due to one brake operation, along with the length X and height Zl. Indicates the amount of wear caused by

To simplify the conditions, when the same force is applied by the brake disc, assumed that the same amount of wear would occur on the lining. Conventional linear chamfer Compared to -, the chamfer of the present invention has a large inclination, and the chamfer 8 at the upper edge is In extreme cases, it is vertical. On the other hand, the contour 6 at the lower edge of the layer has a small slope. and, in extreme cases, parallel to the carrier plate. Therefore, the wear height Δh is very large at the top of layer 8, assuming that the same braking force is applied every time. large, while at the lower end extending along the dashed line G of layer 8 it is very small.

FIG. 3 is a cross-sectional view taken along line A-A, and the contour 7 of the chamfer is hyperbolic in the radial direction. It has become. This corresponds to a chamfered edge region 3.

Summary book Brake shoe with chamfer lining The present invention provides a brake shoe with a chamfer lining. The invention relates to a brake shoe equipped with a ring.

The object of the present invention is to improve the action of this type of brake shoe, and to reduce the amount of brake The key action provides the desired surface of the lining and can prolong the life of the lining. It was made by sea urchin.

The object of the invention is achieved by utilizing a chamfer with a hyperbolic profile.

In this case, as the number of braking operations increases, the wear height during each braking operation is extremely small. It disappears.

(Figure 2) Submission of translation of written amendment (Article 184-8 of the Patent Law) August 26, 1992

Claims (6)

[Claims] 1. Place the brake shoe (1) of the disc brake on the back plate (9). , a lining (2) having a surface layer (8) of a predetermined thickness (S) is fixed; The layer (8) is chamfered at least one of its peripheries (3, 4, 5). If the same force is applied to the surface layer (8) during braking operation, , resulting in the same amount of wear and thus, with increasing braking action, the It is specially chamfered so that the wear height (Δh) is extremely small. The characteristic brake shoe. 2. 2. The chamfer according to claim 1, wherein the contour lines (6, 7) are hyperbolic. brake shoe. 3. Claim 1 or 2, wherein the contour line of the chamfer is the following Xn, Yn. Brake shoes listed. Xn=Xl(D/Yn)−k Yn=Yl(D/Zn)-k here, Xn=Tangentially measured from the center plane of the lining at a certain moment, above Lining length of the surface layer, Xl = tangential length of the above lining D = said lining, measured from the bottom of said lining, i.e. carrier plate Total thickness when new Yn = Height of the above lining at a certain moment n = Brake Number of operations k = constant as wear index of the above lining, where k≧0 4. The chamfer is located at the periphery (3, 4, 5) of the lining (2) However, when newly installed, there is a particularly large The brake according to any one of claims 1 to 3, wherein the brake is adapted to receive a pressing force. Whoosh. 5. The chamfer is located at the upper edge (3) of the brake shoe (1) in the circumferential direction. 5. The brake shoe of claim 4, wherein the brake shoe is elongated. 6. Furthermore, chamfers (4, 5) are provided on the lateral edges of said lining (2). The brake shoe according to claim 4 or 5.